* {
  box-sizing: border-box;
  padding: 0px;
  margin: 0px;
  list-style: none;
}
html,
body,
#app {
  height: 100%;
}
.container {
  height: calc(100% - 44px);
  background-color: gold;
  display: flex;
  flex-direction: column;
}
.container > header {
  height: 44px;
  background-color: gainsboro;
}
.container > main {
  background-color: #fff;
  flex: 1;
  overflow-y: auto;
}
footer {
  height: 44px;
  background-color: gainsboro;
}
